Сохранение значения select и работоспособность второго select после отправки формы

ind.php
<script type="text/javascript" src="ajax.js"> </script>
<?php
echo '<form action="'.$_SERVER['PHP_SELF'].'" method="GET">'."\n";
 
$query = 'SELECT * FROM country ORDER BY id_country';
$res = mysql_query( $query );
$result =  mysql_query("SELECT * FROM country");
echo 'Страна:
    <select style="width: 200px; height: 30px;" name="country" id="country" class="select" onchange="getList(this.value, \'\');">'."\n";
echo '<option value="0"> Выберите </option>'."\n";
while($ctg = mysql_fetch_array($result))
{
 
   echo "<option value='".$ctg['id_country']."'".((isset($_REQUEST['country'])&&($_REQUEST['country']==$ctg['id_country']))?" selected":"").">".$ctg['name_country']."</option>";
}
echo "</select>";
 
 
?>
 
Регион: <select   style="width: 200px; height: 30px;"   name="region" id="region"  onchange="getList(this.form.elements['country'].value, this.value);">
<option value="0">Выберите</option>
</select><br/>
 
getList.рнр
<?php
if ( !isset($_GET['region']) ) {
     $query = 'SELECT*FROM region WHERE id_country='.$_GET['country'].'';
  $res = mysql_query( $query );
 
  $makerOptions = '<option value="0">Выберите  </option>';
  while ( $mkr = mysql_fetch_array( $res ) ) {
    //$makerOptions = $makerOptions.'<option value="'.$mkr['id_r'].'">'.$mkr['n_region'].'</option>';
  $makerOptions = $makerOptions. "<option value='".$mkr['id_region']."'".((isset($_GET['region'])&&($_GET['region']==$mkr['id_region']))?" selected":"").">".$mkr['name_region']."</option>";
 
  }
  $response = '<?xml version="1.0" encoding="windows-1251" standalone="yes"?>'.
              '<response>'.
                '<action>'.
                'makeMakerList'.
                '</action>'.
                '<options>'.
                $makerOptions.
                '</options>'.
              '</response>';
} 
?>